He continued: "The reality is that the defendant did not set out to cause harm that night to Mr Potter, or to anybody else.

"The defendant came under an attack. What developed, developed quickly in that street over a very short period of time.

"He is deeply sorry for what has happened. If he could turn the clock back he would in an instant."

Judge sentences Gasson to life imprisonment

Sentencing Gasson, Judge Gold said: "Arnold Potter began the incident with an intention to rob you and I accept that that is the background.

"You inflicted two deep stab wounds to his abdomen with a knife that you had in your possession. Either of these two wounds would have been fatal.

"You stabbed him once in Atkinson Road and you chased him down into Watson Close knowing that he is already wounded and tabbed him a second time."

Judge Gold accepted that there was no pre-meditation and took into account Gasson's young age.

Gasson was given a life sentence with a minimum term of 15 years, less 149 days of time already served.

Because he is under 18 he will be detained at Her Majesty's pleasure for life. After 15 years (less time served) he will be eligible for parole.

Anonymity restrictions lifted allowing defendant to be named publicly

Following an application by two press organisations - including this newspaper - Judge Gold agreed to lift the anonymity restrictions in respect of Gasson.

Defendants under 18 have automatic anonymity by law, and that anonymity is only lifted in specific circumstances.

Judge Gold said: "There is a public interest in matters of this kind being properly and fully reported so that the public who may be concerned about what is happening in the country generally, or in the particular area of where they live may have a legitimate interest in naming of the defendant who has been convicted of a crime such as this.

"Of course there is significant public concern about knife crime and about knives being routinely carried by youngsters in the street and being used in the context of drug use and drugs transactions.

"It seems to me this is an appropriate case for the lifting of the section 45 order in relation to Kai Gasson. I therefore make an exception order accordingly."

DCI Richardson speaks about the investigation

Detective Chief Inspector Andy Richardson, who led the investigation, said: "Knife crime hasn’t just affected the two individuals involved, it has also affected their families, friends and the wider community and my thoughts our especially with Arnold’s family at this time.

"The key element to this tragic incident is the possession of a knife in a public place, which is an extremely serious offence.

"The devastation caused by knife crime is well documented, and Sussex Police – like every other force in the UK – will not tolerate it.

"We must continue to educate people – particularly young people – that carrying offensive weapons in public is a serious offence which ruins lives. It is a common misconception that some people feel safer in possession with a knife. This cannot be further from the truth, carrying a knife makes you far more likely to be involved in a crime, whether you are the victim or the offender.

"Our message is simple: lose the knife, not your life."

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